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Propellant Flow Actuated Piezoelectric Igniter for Combustion EnginesA propellant flow actuated piezoelectric igniter device using one or more hammer balls retained by one or more magnets, or other retaining method, until sufficient fluid pressure is achieved to release and accelerate the hammer ball, such that it impacts a piezoelectric crystal to produce an ignition spark. Certain preferred embodiments provide a means for repetitively capturing and releasing the hammer ball after it impacts one or more piezoelectric crystals, thereby oscillating and producing multiple, repetitive ignition sparks. Furthermore, an embodiment is presented for which oscillation of the hammer ball and repetitive impact to the piezoelectric crystal is maintained without the need for a magnet or other retaining mechanism to achieve this oscillating impact process.
Document ID
20150003436
Acquisition Source
Glenn Research Center
Document Type
Other - Patent
Authors
Wollen, Mark A.
Date Acquired
March 20, 2015
Publication Date
January 13, 2015
Subject Category
Spacecraft Propulsion And Power
Funding Number(s)
CONTRACT_GRANT: NNX10CD19P
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-8,932,047
Patent Application
US-Patent-Appl-SN-12/906,360

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